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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aac737738780913f698817111dabaa466941988d7995d386bab4c0a035f9cb14' 
  AND token = 'RGV1RgR6e9uJbQSVtr4omMYPk76Y/38sHoPiMSuwXIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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