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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '889509cd106268ec40323d2b505c558603970419b16a591eac79a1b24c8c6f6c' 
  AND token = 'NR4PZ67nCUzDxAdEJPIvaKBc0/0BTKqwm3OTxm7Gz5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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