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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ee1d9f31919205f8efb64a6083057d92950b5cbadd90211d68f7f5346f76114' 
  AND token = 'yTJGC0NaryfsmI1Ae643XHxPQP01pQqIYSWwMENBXZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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