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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eba29b940de31533772db01c87e8b0e1e62d04f9cd4006073828306914510d6' 
  AND token = 'PHa1Ht9KkArCvFXO8emZ2z3KUW4krY7htC2hLM6yIjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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