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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0793d1179ad84f0de7a197bbc5f7d758760a904791843aec0c5764cba2b7b620' 
  AND token = 'FWL2v3gJpmPtbbXIT/TCUdiKOWOCoehLNeZ2Mw5G2pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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