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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b52fcc6d0ab76a1881bcc8c11419e4b4e199add1667c17f3c77c906f6c092990' 
  AND token = 'aWLDOnKMl3v6mUyPm+HVRzms4R9TPBaGLM570673/wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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