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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a6a7a888981a6579bab3c9d59ab16b0d8bdaf2589502bc993d4615643a8aa99' 
  AND token = 'a4jBe97NUeT99W4Hb9uJGOV/crdyTqCwLyes9Itt5G4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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