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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e38763d1a57659d9b75c5e990d4aa7a9c750187ef376071325e8c5b2e33c3196' 
  AND token = 'LiCdiCPz+8YS4i70JTiZUVoX7ADCW9uJJMUOo6dYMZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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