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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec4f9596385b4b4e0edc223b193e66f0fb56f81a9f7b20f016690d09a5134ae' 
  AND token = '89ijnXsxvm4P48zTV3MEqPE3cxI/qQBPWFL4cpWoKq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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