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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac3a33b04a1264930072d6858297c51408ffea2eab30f4f1b8cdd67ed1ab033' 
  AND token = 'pIDr08ROKNTy2UzKr+qTLIZbYhckFunIj3wEdLqaRyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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