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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a058cfd3b58bbb3ab3f2d2259a60c3891cf3214c085f6e42e2f011cd4122f79b' 
  AND token = 'iysi8yW8tk670gLes7s6MgvtPi82tWtkjFVMq4a97KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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