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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ae8526a2a0c375a567e0f70f890fa1a45965afafdd9f1723692e966f1bbf97b' 
  AND token = 'nzwPMykuH7IsDCP6PC3D8bblV7sZ90sn/82w0s8Bij4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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