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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96db2ea35e4497efe800f4d5dacf2fbbcf15b6039416cf4b5250cae67716ff0a' 
  AND token = 'eaeqAtxqKdyAX7CbIVrDidZWvcP+M1k2rjJrGpZ8ZEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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