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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fba4df2cdbed96d1019d29977aeaea26482fb51bdf50b897f8911821d599145' 
  AND token = 'PzXO05fj+pFI/OAJ7II8b78jCizBHSehC+krc6yy/jM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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