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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed6f8f685f4a01620de6d340f11adea336ca0b8aabba8c17ab2400fca72ab214' 
  AND token = 'DYDCdJiBerVJff6KQ2nWAxmsaI/BOkrN0Q23HzF0r9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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