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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38e7b364d2ed69d70d01602f0d13b68a4817b8034f856c148c6fe7b0a8805cc7' 
  AND token = '9B/4X/SJcuXWKqvvaKAA2CnW2Z43v/EGM2AdNp8fp18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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