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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7534b5a9369ef8f90bd52027a1351c63f15ee68edfcaaaf9dcc17daec36da42' 
  AND token = 'GGvUUxusXrSWCzRz7Uan6+P65wq9s4jyzTrXXcdEtpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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