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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9696ccac412780f02dbfa93878860362fa581dfee3b44f04e6999b4d8522a0' 
  AND token = 'Elasqb9trcjvMv9rVtTyE71TE/xQ6R2YoXV5GkXCkGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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