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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b523213fa98826fd3daa55777c7f5227a5cc210a2ddcb15fe2fe150bfb8a2e' 
  AND token = 'JuC1PMahGCnC/Z9GxvNEFrlaqu3Ih1uuqjspfltep2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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