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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2aaca92d4b789130b0b5f7956d13e97a948858659b76bbadf7979bd8f974263' 
  AND token = 'iKy92m5yv76rh1wIdJv2YP9VAR4AKUIOe9OEDucww8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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