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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dfbf8bf30f3963a27a0f136cbd14676e9adea3a785152c9ec153b8c2375f901' 
  AND token = 'rpRYtforMdoeNvhP82jtre3ZECK5CABredAaxIQewFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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