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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea6ef85c7d6960093019d0afe73cdb110b45bc6f7969c1fb1dc3875a2a0d698e' 
  AND token = 'ouY92qvXJ2IwyHsSxRCJn+QuTIIa4ZlX3r435uWegbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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