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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f54639e4817b2dd4ab029b5cbc08b7a2292b35b3cc4d458181e03b0999a057bd' 
  AND token = 'olez1mbXOjFFQuCpeDvKCN4gnFPshVMKiFNheLN9bfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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