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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '660984c2a59a2143d2505a0a30158525cedc80282664292ca1ac8f1dbb0d5fb9' 
  AND token = 'We2B034CAYevtqqr1F7XZ8RU8HHW+CGkxxE4nDaoZPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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