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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ab7f52efbc3baf67522bacd7805327c9de1599f135601957350b42596e28aa' 
  AND token = 'Dobypy4dLSP5saIi0wozpxrEMDpdYfyx1R+GJfpk39w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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