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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7baafc9680908e6bd16a7753da1ef8c844d24076c444f2990c8b98b73c2a4710' 
  AND token = '7Ak4rX2f3EX3I2WaqXFDyZh5j3G9lIrFKePweAgWfW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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