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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '829d6a2f3b4f310dcb0defaffc9e08baf7b90b076da713ee81936dd6e1c2302e' 
  AND token = 'KE65LZ10QgfROLCAyhITbg0bCqSirNdZVNau/Gq9UtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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