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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9171cf7cd047d967cdc762babf8c8a00b9bb89805948301ba2386708bd52aa8a' 
  AND token = 'uSEtT2rZbC+1bIWcdcNYIM3CLbA5/QFP2f/zJ06vT9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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