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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f9a73c4a6a5012fc5a1c4d7a72e8f77f3ed478c63d0c4f6b299b0e57d50bb1' 
  AND token = 'VQwXAfER+WlXLurX119QEE1jjj2Kdj7wZgDZSWfAhAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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