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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbdaea19556d12db19b3a04ae76ea18cd74feeb5aa8704a332a85b411adc43fc' 
  AND token = '2FJExDGrg4SfulqDC0U7U2L/YVoOV6StCOPm81z+Tfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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