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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba4775c02dca37574fc0de07df22a82f579a03a06539db7f7c625b22e7d9dd1c' 
  AND token = 'dy/BGT9tg3DztMqkQGSJV1DXya/vs06Eb09xJrVtK7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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