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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05759e81300e012ed772f77546ad64d3f4e814325f6d4896aa3588aec55a2d32' 
  AND token = 'OHUOg0s/aKy8JddqFluQhxoWUyp8xMwK9sn41xw2Fp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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