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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5002b687bfb03609f0f4f45bca50fd4c423f8def4444f58a1f924c2786dbcf80' 
  AND token = 'iIAhYuVkuz9rdUvXj8WWyktR2nhjT9LP7QzrismZR0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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