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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd620b2a71d7c51934ebe969dd4ad3bd8584893cb7d448b9d524ec05a24d769ce' 
  AND token = '0QxFzUYJEu5CrvB56BTL9glJmbdhd8fdgbzAwU7At+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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