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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd6d00eaeabf39b63ab4bc637e67721c1287dea52bfd3fdd97af8d5478851f91' 
  AND token = '3dSmrjFW43GTO17/J3eTrg/LfbMpQkMUosbLJc1ulfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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