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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c3137e4b87bd25ed20e6edecf803e4e34f90d0ea350871de61137d0c0a9e423' 
  AND token = 'FRbnynD4Dbr6ehSAybc97IdWxECkFfRZ0a9kKqRDaFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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