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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6504a6bf89f36b39a5d71dab47ed4771a44ee3d1abbc16fb19da74c3afc2f4d' 
  AND token = '3WAKyhBHJr3zPebfEWh2aiYRbbT3LlycAqKER+SwsKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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