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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f89da77d45be01ccd8a5aac43e9439a8dac4a7ea83ae97e14e7a2e5ebd7a8c' 
  AND token = 'ScA5rjnFlkZr88kwdTRF75EZ+9aCz0HBWFO4tuZVbU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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