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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bcced96acabf2b8fcf97b6abc6edfe262a0ba992f2de7505e4638f87f96e895' 
  AND token = 'vD+LVc6Cl6u0INnZaP7mx8nKAs65ktGlXAWw2Bv9CN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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