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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35bd20f9f49a6f8aee8f7d78aaebaf4b3964b4030af5b619cfe6af6fce7bd97c' 
  AND token = 'lmXRJV53Cihjd8mgEO1r0qBmbsPTg3jMgnLmNije484=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}