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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76bd52ee8ca0facb5d8b2bde1f8a0b6bae883bc156064bb307abaaa777d146c3' 
  AND token = 'Kf44IR6pJSfxuKrKZuEIvy5cRqZI9rCVj48Ha/UeoCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

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