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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '976b70eb48317beed75ee50e9373e1509ee6ac2bc81d3c4e49bbb257771aa79e' 
  AND token = 'qs3dnFeKhF0LbuB5T7U2kE5XH9OnXNvBJwX3dF3cO4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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