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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c8510ea067105d307e397c5cb9ffd3d07382919013c68b5c21398a55b707bdf' 
  AND token = '1dLPoYtuBI8bsLI0HSH79VVbrc2vueQXdK5z9AG4Qz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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