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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '924bf13de0a988e3b8072a62b7031fc17a66f5a05f563ba8a997d892df54cd70' 
  AND token = 'Sk+sNKv9B4NdR4aks8kt+cODW7+V0H23qpurAoh2vOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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