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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acef7f3622998d95e16752d10291a040aa6cdc79543eb2462aa716bdd5cf3bd9' 
  AND token = 'V2/GFcJrV9YbyChbf08zO3Zbx21gJ3GG7qGV1KUB70I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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