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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c497079755fe39922b3bd224552f22ea938fef170dcb9790fd8243b8bdaf1afa' 
  AND token = '7lRPJFe3HIxylti3oP8/ILumuOThme90+1Q/oMhwi+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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