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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8777a10a9189adca1f19ef0fc2007a2ef38440cf0bb4db4f00f9b3bd2b7173d0' 
  AND token = 'J9+4r9xnLVQBL5I6YR8AOAloDXYA7rtuGnCvmIvE5so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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