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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc62eae8906d3e0144009a8c2569b03e1cf63b77e77ff3a105e925a564951909' 
  AND token = 'q9ynyqxtTGB3kADa9o4lYLlMai6ANFwxEx4ix44/3s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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