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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6c8cfc9e344d95ae6e7f9ac572ce4fb98d64af61a031e1356e981d0e423dccc' 
  AND token = '+aywNceC75GmPE6AuMpoQNajGxd0x/MNEOB5MVK/06o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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