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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23766c77f4292469df55ae37295408f355f229c601c90e8e8b8b07846f817bd5' 
  AND token = 'hLogNQwtRhSc5TaKJREhd59/nfYClxIpg0xQ+jtm80o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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