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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0b4a90133c1a4acf202d0ce05dd79853c6afb1b275a96ff4613f791f9c65ae9' 
  AND token = 'xdp4/NS93V9QbGt4qUY+Xv9xB27tP/c/sKNCypb6ew8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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