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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '600c7491397e1c402188986c76267e46ee35254f0fb6b2e62a6bfcc0fd42028f' 
  AND token = 'OXo1Nub8lyHKnkaK7/0wRRh0en/zwDty8qDV2pN5E0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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