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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20d0d94e660867b7d4eea5ae340c1af6931f01af2692b15bde02b3b2bd2dc04c' 
  AND token = 'ek+JlyqSX/vqvIaVKRF6O7VTC1nEfiNX33RLpyTHnG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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