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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e5c04cf26173b1b694db77ff112dbb23bbe8b9c7a14969d25f4cff229d1f07b' 
  AND token = 'o/87uLidph4b81lnX5dK2cu5JOzfCcvUrT2AFY2SRhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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