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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c52e16fd623c00b0545c6ba6484795d25e848858e1838cb1da83d6a9595bbb' 
  AND token = 'A/2P9CWbXjEbEQClaDXLf1Z51snDSmubIjneMQ6DEBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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