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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3467bee53a64ee31ae5c2f6461ff410b94f0bec76988f8ab49b66436e62ce87' 
  AND token = 'FWTbarbvMqdcMIVVY8bQnCIn7HEKTp9qk8lRee1aGNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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