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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd02fc9796ebedd2ee63e1e011d3179f3024bfa93a0390e4d129b03e939738f09' 
  AND token = '9BL8Lh14Ks6N0UDNUk+m/kVjIBlkzw6PcCpSuknWXiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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