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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dbbbeb03de4e60317a51815c9c296034a0bc18a00cdc04fc5404fd5feb5d691' 
  AND token = 'pGsSxcPQ2IkElX37EWAsPqRQM+AL+oBl8Elx3y91K7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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