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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '051de169a7c52119238f9293a04d2955535d137204d1d1925c1d55f34e8e7f0f' 
  AND token = 'CHCRDMsH2wmOsz1441aKpXJStw2dHveU01MRiXa/GfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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